On alloying Iron unih Manganese. 16!> 



be composed of Iron . . , . . . . . 78*6 pts. 



Metallic manganese .. .. 21*4 



100 

 The metallic button and some of the largest globules were not 

 acted upon by tlie magnet. 



7th Exp. Iron ore . . . . . . . . 500 grs. 



Roasted ore of manganese . . . . 500 



Chalk .. .. .. .. 400 



Glass .. 500 



Charcoal .. 160 



The fusion of this mixture afforded a carburetted metallic 

 button equally keeshy and shining with the former. 



Weight 254 grs. 



Globules 70 



324 

 Equal to 64-fS^ per cent. This is an increase of metallic pro- 

 duce beyond that of the assay of 74 grains, which from 500 

 grains of ore of manganese is equal to 14^»g-per cent. One 

 hundred parts of this alloy will be composed of 



Iron 78-6 pts. 



Manganese .. ., .. 21*4 



100 

 The glass obtained in this as in the former experiment was 

 of three kinds, though considerably different ; the upper surface 

 was glazed witii a brown metallic coating mixed with carburet of 

 iron ; und^r this vvas a greenish-coloured porcelain with a few 

 specks of more perfect glass. Beneath these was found the 

 principal mass of glass, of a white agate colour, but not trans- 

 parent. The smallest globule now obtained was not in the least 

 attracted by the magnet. 



Sth Exp. Iron ore . . . . . . . . 500 grs. 



Roasted ore of manganese . . . . 600 



Chalk 400 



Glass 500 



Charcoal 160 



This mixture produced a button and globules still more highly 

 carburettcd than any formerly obtained, weighing 350 grains, 

 equal to 70 per cent. ])ro(luce from the ore of iron. This increase 

 of metallic weight l)eyon(l the assay prodnio being 100 grains, 

 is equal to 16-^''^ per cent, from the quantity ot manganese em- 

 j)loycd. No part of the product was magnetic, though eight 

 grains of magnetic carburet was found unacted upon. 



The 



